168503535507 has 4 divisors (see below), whose sum is σ = 224671380680. Its totient is φ = 112335690336.

The previous prime is 168503535491. The next prime is 168503535521. The reversal of 168503535507 is 705535305861.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 168503535507 - 2⁴ = 168503535491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (168503535307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28083922582 + ... + 28083922587.

It is an arithmetic number, because the mean of its divisors is an integer number (56167845170).

Almost surely, 2^168503535507 is an apocalyptic number.

168503535507 is a deficient number, since it is larger than the sum of its proper divisors (56167845173).

168503535507 is an equidigital number, since it uses as much as digits as its factorization.

168503535507 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56167845172.

The product of its (nonzero) digits is 1890000, while the sum is 48.

The spelling of 168503535507 in words is "one hundred sixty-eight billion, five hundred three million, five hundred thirty-five thousand, five hundred seven".